I think it depends on how comfortable/confident you are with your equipment, and your routine/travel. When I started vaping after two battery failures in two days (and I only owned two batteries), I carried two of everything, with basic caches at home/work/vehicle. Multiply juices x delivery mechanisms plus tools, paper clips, lots of napkins, preferred carry case of the week, differing chargers, blue foam, blahblah.
Now for my everyday carry I keep a device and 10ml of juice in my shirt pocket.
Now for my everyday carry I keep a device and 10ml of juice in my shirt pocket.
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